Insulator for electrical wires



(No Model.)

F. E. KEYES.

INSULATUE EOE ELECTRICAL WIRES.

No. 383,734. Patented May 29, 1888.

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UNITED STATES PATENT EEICEo FRANK E. KEYES, OF PETERBOROUGH, N EV HAMPSHRE,

iNSULATOR FOR ELECTRICAL WIRES.

SPECIFICATION forming part of Letters Patent No. 383,734:` dated May 29, 1888,

Application filed February 3, 1888. Serial No. 262,856. (No model.)

fb aZZ whom it may concern.-

Beit known that l, FRANK E. KEYES, of Peterborough, in the county of Hillsborough, State of New Hampshire, have invented a certain new and useful Improvement in Insulators for Electrical XVireS, of which the following is a description sufficiently full, clear, and exact to enable any person skilled in the art or science to which said invention appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure l is a side elevation of a glass insulator now in ordinary use; Fig. 2, a top plan View ofthe same, showing the method of attaching the wires; Fig. 3, a side elevation of my improved insulator; Fig. 4, an end elevation ofthe same, and Fig. 5 a viewof the fastener.

Like letters and figures of reference indicate corresponding parts in the different figures of the drawings.

My invention relates more especially to that class of insulators which are employed for supporting telegraph, telephone,and electric-light wires; and it consists in the novel features herein set forth and claimed, the object being to produce a simpler and more effective article of this character than is now in ordinary use.

The nature and operation of the improve-` ment will be readily understood by all conversant with such matters from the following` eXplanation.

In the drawings, A represents the body of the insulator, B the wire, and C the fastener.

The body A is preferably composed of compressed wood pulp, commonly known as indurated ber, although my improvement is equally adapted for use with insulators cour posed of glass or other non-conductors of electricity.

rPhe body A is of the same general form as thcinsulatorsin common use, and is interiorly screw-threaded at a", to adapt it to be readily attached to the arms of a telegraph-pole in the usual manner.

The top of the body A is rounded at on and has its sides flattened, as shown at in Fig. 4. A vertically-arranged lateral slot, n, is formed in said top, (see Fig. 3,) said slot being of suf ticient size to allow the wire B to pass through it and rest in its inner or lower end, t, which is slightly enlarged and circular in cross-sec tion. A transverselyarranged hole, lr, passes through the top of the body A at right angles to the slot e and just above the rounded portion t thereof.

The fastener C consists of a piece of elastic wire, which is bent at d to form the arm o. This arm conforms nearly with the curved top of the body, and is provided with an indentation or bend, i, near its free end, adapted to fit into the top of the slot '0, where it is held by the spring or elastic action of said arm, thereby keeping the fastener in position when in use. The body A is also provided with a transverse groove, h, at each end of the hole it, the purpose of said grooves being to enable the wire B to be attached to the insulator in the usual manner, should it become necessary.

The ordinary means for attaching the wire B is by a short wire, f, (see Fig. 2,) which is passed around the top of the insulator in the groove h, and has its ends twisted around the wire B to hold it in position. In using this method it is exceedingly difficult to draw the wirestaut between the supporting-poles. Moreover, the binding-wiresf greatly weaken and divert the electric current, which is discharged from the ends of said wires to a greater or less extent, in accordance with the state of the at mosphere. u

In the use of my improvement the body A is screwed onto the arm of the telegraph-pole in the usual manner, and the wire B passed through the vertical slot yv and permitted to rest in the enlarged portion t. The straight portion or body g of the fastener C is then inserted in the hole c-and the bend yforccd over the curved top fm ofthe body until it springs into the top of the slot v, thus preventing the wire B from becoming accidentally remove from said slot.

It will readily be seen that as the metallic fastener C does not come into contact with the wire B the electrical current will not be in. terfered with or dissipated. Furthermore, the wire B can be drawn much tighter between the poles when not bent around the insulator, as shown in Fig. 2, and by enlarging the slot c, as shown at t, the wire is permitted consid IOO erable lateral motion or play without dan- 2. In an insulator,the fastener C, having the ger of breaking the insulator, as frequently arm r and bond y, in combination with the happens when it is fastened in the ordinary body A, having the slotJ o and hole lr, substanmanner. tially as setforth. 5 Having thus explained my invention, what I claim is 'Y FRANK E. KEYES.

l. In an insulator, the body A, having the slot n and hole k, in combination with the fast- Witnesses: ener C, inserted in said hole and provided with M. L. MORRISON, i xo the arm r, substantially as described. N. F. CUMMINGS. 

